Journal
FISHERIES OCEANOGRAPHY
Volume 27, Issue 5, Pages 435-444Publisher
WILEY
DOI: 10.1111/fog.12264
Keywords
biophysical model; egg survey; haddock; spatial distribution; spawning
Categories
Funding
- VISTA - Statoil [6163, 727890]
- Norwegian Academy of Science and Letters
- Research Council of Norway's (RCN) project OILCOM [255487/E40]
- RCN project SUSTAIN [244647/E10]
- Nordforsk through the project: Green Growth Based on Marine Resources: Ecological and Socio-Economic Constraints (GreenMAR) [6163, 727890]
- RCN project CoDINA [255460/E40]
- EC H2020 RIA INTAROS [6163, 727890]
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Despite the importance both in an ecological and management context, much uncertainty remains about the underlying factors controlling spawning ground use in marine fish. Here, we investigate how spawning ground use of Northeast Arctic (NEA) haddock (Melanogrammus aeglefinus) has changed over time. By combining data from a Soviet-Russian egg survey conducted over a 35year period (1959-1993) with a biophysical drift model, we estimate annual median spawning latitudes of NEA haddock. Furthermore, we test for statistical association between the median latitude of spawning and covariates that are candidates for shaping the spawning distribution of haddock. The results indicate no association with temperature, as measured at the Kola transect, or demographic structure, as measured by the mean weight of spawners. However, we find a positive and significant association between spawning latitude and spawning stock biomass, indicating that density-dependence may be more important in shaping spawning location than other factors such as temperature and demographic structure. A potential mechanism for the reported effect of spawning stock biomass may act through the distribution at the feeding grounds, which is reported to expand north- and eastwards at high population density.
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